What can farmers do to make sea cucumbers safe for the winter?
As the weather gets colder, the temperature difference between morning and evening increases and the water temperature changes greatly. In addition, the water quality of the pond becomes worse, the bottom becomes dirty, and the sea cucumber is prone to stress, which leads to its physical decline and infection. On the other hand, the northern winter ice age is long and the ice layer is thick, so sea cucumbers are prone to get sick after wintering. Therefore, the management of sea cucumber pond culture before and after ice sealing is particularly important. The management points are as follows:
First, the management measures before freezing
1, deepen the water level
According to the situation of the pond, it is suggested that the water level should be deepened to above 1.5m before freezing. On the one hand, the deep water level is beneficial to the pond's thermal insulation, reducing the influence of low temperature on sea cucumber, on the other hand, it inhibits the growth of moss under the ice to some extent, which is beneficial to the prevention of bubble disease.
Step 2 treat the bottom material
Before freezing, use "Dijuan" or "DiFuAn"+"bottom oxygen" to change the bottom for detoxification, thoroughly decompose organic matter, remove bottom toxins, and create a comfortable environment for sea cucumbers. This area is dominated by the old circle, and the ponds are generally aging, acidified, organic and toxic. Secondly, after a large number of feeding in autumn, a large number of residual bait and feces have accumulated at the bottom of the sea cucumber pond. In addition, dead fish, dead shrimp, dead crabs, protozoa and zooplankton (turtles and copepods) remain in the pond after the damage of the enemy is removed. These dirty things ferment at the bottom of the pond to produce toxins. If not treated, sea cucumber will directly affect its feeding and ingestion in winter, and in severe cases, it will cause local peeling or a large number of deaths.
3, supplement nutrition, enhance physical fitness
Before freezing, use "activation" and "nutrition express" to supplement nutrition and energy for sea cucumbers and enhance their physique. In this autumn, ponds are generally poor in reef, low in food intake and weak in constitution. Proper use of "activation" and "nutrition fast line" is conducive to improving the vitality of sea cucumber, resisting the changes of water environment before freezing, and is more conducive to sea cucumber crawling and feeding under the ice.
Step 4 supplement high-quality bait
Feed the high-quality ecological material "Limiaoduo" before freezing, the dosage is 5 mu/bag, and feed it regularly for 5-7 days, so as to seize the stable feeding period of sea cucumbers and ensure that the sea cucumbers have enough bait before freezing. Limiaoduo contains a large number of beneficial bacteria, which has a good feeding effect and promotes intestinal digestion of sea cucumber. It has no influence on water quality and sediments, provides a good and stable environment for sea cucumbers, and helps them to grow, gain weight and produce quickly!
Second, the key points of management after ice sealing
1, regular observation
This area is frozen for a long time, and the climate is unstable. A large number of sea cucumbers will die during the frozen period. Therefore, it is necessary to regularly observe the quality and water quality of sea cucumbers under the ice, pay attention to the crawling and feeding situation of sea cucumbers, and observe whether sea cucumbers have symptoms such as peeling and mouth swelling.
2, ice eye
After beginning of spring, the temperature warmed up, the ground temperature rose, the photosynthesis of algae in the water was enhanced, and the oxygen in the water was easily supersaturated, which led to bubble disease of sea cucumber. Ice drill can release supersaturated gas, which is also beneficial to observe the situation of sea cucumber. Under the condition of ensuring personal safety, make ice caves according to the situation in the circle (the number of ice caves will change from less to more after the rain, and finally it can be about two acres with a diameter of about 1.5 meters).
According to the observation and summary in recent years, there is basically no bubble disease in ponds with ice caves in early spring, and the sea cucumber after melting ice is also beneficial to crawling and feeding.
3. Water inflow
Conditional ponds should be flooded after spring. According to the air temperature, water temperature, water leakage in the pond, etc. And on the premise of minimizing the stress on sea cucumber, the water intake should be controlled reasonably, and the water exchange should be increased from rainy season to stormy sun season. Changing water can promote water convection, release supersaturated gas in water, reduce the occurrence of bubble disease, and also help to melt ice in advance and promote the early growth of sea cucumber.
Thawing period is a high incidence period of bubble disease, especially when there are many mosses in the enclosure, poor water intake conditions, unclean water and fertilizer at the bottom and bubbles on the bottom reef. According to our measurement, the dissolved oxygen in these circles is basically above 20mg/L, and the oxygen saturation is greater than 180%. In some circles, sea cucumber will swell, in which case it is easy to drift after thawing. Therefore, preventing bubble disease is the primary task of sea cucumber during the thawing period, and it is also the main factor to improve the yield of sea cucumber culture in ponds.
Prices have risen this autumn, and everyone's enthusiasm for farming has also increased. I hope everyone will strengthen the management before and after the ice closure and put increasing production in the first place. Liyang Fishery Pharmacy will improve its service quality, and at the same time, it will increase the training for everyone. I wish everyone to produce by going up one flight of stairs next year.